Ernesto - I have no idea.
One thing about the Kuki family that I find fascinating is that I've heard they are one of a number of clans that have maintained an alternate history of Japan - they have old texts based on oral tradition that are both variant forms of Shinto, and have myths that are different from the standards in the Kojiki. Evidently, the Kojiki and Nihon Shoki were compiled from the myths of the most politically dominant clans. Certainly these texts are not released in English. I do not know if they have been released publicly in Japanese either.